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But your port is flared

I would go my real motion of the driver.

Adjust 1/2 inch at a time until you get the correct tuning.

You know JBL empirically tunes their systems.

The impedance...

Where are the ports located? Don't locate a port closerthan one diameter to a side or rear wall.


In Bassbox 5.1 (a professional program) the length for 2 x 4 inch ports is 8.4 inch (no fibre...

Below is s starting point

http://www.audioheritage.org/vbulletin/showthread.php?40531-DEEPER-BASS-D-B-KEELE-E-V-s-STEP-DOWN-MODE&p=412444&viewfull=1#post412444


The idea is you trade a some...